/ Dictionary / Index N nucleoside: Meaning and Definition of Find definitions for: nu•cle•o•side Pronunciation: (n'klē-u-sīd", ny'-), [key] — n. Biochem. any of the class of compounds derived by the hydrolysis of nucleic acids or nucleotides, consisting typically of deoxyribose or ribose combined with adenine, guanine, cytosine, uracil, or thymine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nucleoside (Thesaurus) nucleosidase nucleosome Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language